*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  overflow-y: scroll;
}

body {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.45;
  color: #1a1a1a;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 650px;
  margin: 0 auto;
  padding: 125px 24px 80px;
}

/* ── Banner ── */

.banner {
  width: 100%;
  overflow: hidden;
  margin-bottom: 36px;
}

.banner img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  display: block;
  border-radius: 6px;
}

/* ── Typography ── */

h1 {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

p {
  margin-bottom: 16px;
}

/* ── Links ── */

a {
  color: #1a1a1a;
  text-decoration: underline;
  text-decoration-color: rgba(0, 0, 0, 0.2);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s ease;
}

a:hover {
  text-decoration-color: rgba(0, 0, 0, 0.6);
}

/* ── Collapsible sections ── */

details {
  margin-bottom: 16px;
}

summary {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  list-style: none;
  color: #1a1a1a;
  padding: 4px 0;
  user-select: none;
  display: inline-block;
}

summary::-webkit-details-marker {
  display: none;
}

summary::marker {
  content: '';
}

summary::before {
  content: '[ ';
}

summary::after {
  content: ' ]';
}

.toggle-icon {
  margin-right: 2px;
}

details[open] > summary .toggle-icon {
  font-size: 0;
}

details[open] > summary .toggle-icon::before {
  content: '−';
  font-size: 1rem;
}

summary:hover {
  color: #555;
}

.details-body {
  margin-top: 12px;
  padding-left: 32px;
  overflow: hidden;
  transition: height 0.3s ease, opacity 0.3s ease;
}

.details-body p:last-child {
  margin-bottom: 0;
}

/* ── Footer line ── */

.footer-line {
  margin-top: 8px;
}